[Mesa-dev] [Bug 100069] Dirt: Showdown bad performance with enabled advanced lightning

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100069

            Bug ID: 100069
           Summary: Dirt: Showdown bad performance with enabled advanced
                    lightning
           Product: Mesa
           Version: git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: glsl-compiler
          Assignee: mesa-dev at lists.freedesktop.org
          Reporter: gr.muench at gmail.com
        QA Contact: intel-3d-bugs at lists.freedesktop.org

Created attachment 130078
  --> https://bugs.freedesktop.org/attachment.cgi?id=130078&action=edit
menu options

With higher GL versions, Dirt enables "advanced lighting" options in the
graphics menu. Setting this to "On" makes the game basically a slide show.
FPS is going down from 60 to 10.

Im on a Radeon HD 7970. Also all other Radeon cards seems to have a performance
problem:
http://www.phoronix.com/scan.php?page=article&item=mesa171-pro60-rx470&num=2

where figures looked better in 2015 (but probably because Opengl 4.5 wasnt
there)
http://www.phoronix.com/scan.php?page=article&item=dirt-showdown-linux&num=3

Some more infos about the lightning options:
http://www.rage3d.com/articles/gaming/codemaster_dirt_showdown_tech_review/index.php?p=2

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